uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/backup/stenc/default.nix

@@ -0,0 +1,30 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, gitUpdater
+, autoreconfHook
+}:
+
+stdenv.mkDerivation rec {
+  pname = "stenc";
+  version = "1.0.8";
+
+  src = fetchFromGitHub {
+    owner = "scsitape";
+    repo = "stenc";
+    rev = version;
+    sha256 = "0dsmvr1xpwkcd9yawv4c4vna67yag7jb8jcgn2amywz7nkpzmyxd";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  passthru.updateScript = gitUpdater { inherit pname version; };
+
+  meta = {
+    description = "SCSI Tape Encryption Manager";
+    homepage = "https://github.com/scsitape/stenc";
+    license = lib.licenses.gpl2;
+    maintainers = with lib.maintainers; [ woffs ];
+    platforms = lib.platforms.linux;
+  };
+}